71286638 has 4 divisors (see below), whose sum is σ = 106929960. Its totient is φ = 35643318.

The previous prime is 71286629. The next prime is 71286671. The reversal of 71286638 is 83668217.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 71286595 and 71286604.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17821658 + ... + 17821661.

It is an arithmetic number, because the mean of its divisors is an integer number (26732490).

Almost surely, 2^71286638 is an apocalyptic number.

71286638 is a deficient number, since it is larger than the sum of its proper divisors (35643322).

71286638 is a wasteful number, since it uses less digits than its factorization.

71286638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35643321.

The product of its digits is 96768, while the sum is 41.

The square root of 71286638 is about 8443.1414769622. The cubic root of 71286638 is about 414.6382641614.

The spelling of 71286638 in words is "seventy-one million, two hundred eighty-six thousand, six hundred thirty-eight".